package 剑指offer.反转链表_15;

public class Main {
    public ListNode ReverseList(ListNode head) {
    	if(head == null) return null;
    	ListNode pre = null;
    	ListNode next = null;
    	while(head != null){
    		next = head.next; 		
    		head.next = pre;
    		
    		pre = head;
    		head = next;
    	}
    	return pre;
    }
}
